Capacitive Level Shifter for Faster Cross-Voltage Signal Conversion
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Solution Overview
Problem
Existing electronic devices face a decrease in operating speed due to the limitations of traditional level shifters when handling signals across different voltage domains, which hinders efficient signal transmission and increased power consumption.
Innovation Solution
An electronic device is designed with a level shifter that includes a capacitor to adjust voltage levels and drivers configured to toggle between power supply voltages and ground voltage, enabling faster signal conversion and transmission by using thin-oxide transistors and a capacitor for improved coupling efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a traditional level shifter is used to convert signals between voltage domains, then signal transmission between different voltage levels is enabled, but the operating speed of the electronic device decreases
Solution Approach 1:
The level shifter is divided into multiple independent stages: a first level shifter that converts the first voltage level signal to an intermediate voltage level, and a second level shifter that converts the intermediate voltage level signal to the second voltage level. This segmentation allows each stage to operate optimally within its voltage range, improving overall speed while maintaining signal transmission capability across different voltage domains.
Solution Approach 2:
An intermediate voltage level is introduced as a mediator between the first and second voltage levels. The first level shifter uses a first power supply voltage to generate this intermediate level, and the second level shifter uses a second power supply voltage to convert from this intermediate level. This intermediary approach enables faster operation by avoiding direct conversion between widely different voltage levels.
2Use of energy by moving object
If the voltage level is reduced to decrease power consumption, then power efficiency is improved, but the ability to communicate with external devices following higher voltage protocols is compromised
Solution Approach 1:
Different parts of the system operate at different voltage levels optimized for their specific functions. Internal circuits operate at the lower first voltage level to minimize power consumption, while the level shifters enable communication with external devices at the higher second voltage level. This local quality approach allows each component to operate at its optimal voltage, achieving both power efficiency and protocol compatibility.
Solution Approach 2:
The voltage domain is segmented into multiple levels with dedicated level shifters for each transition. The first level shifter handles conversion from the low power domain to an intermediate domain, and the second level shifter handles conversion to the external communication domain. This segmentation allows the system to maintain low power consumption internally while adapting to external voltage requirements.
3Device complexity
If a direct level conversion circuit is used between voltage domains, then device complexity is reduced, but the operating speed deteriorates
Solution Approach 1:
The level conversion function is segmented into two separate level shifters operating at different voltage domains. The first level shifter operates with a first power supply voltage to convert from the first voltage level to an intermediate level, while the second level shifter operates with a second power supply voltage to convert from the intermediate level to the second voltage level. This segmentation improves speed by allowing each stage to be optimized for its specific voltage range, despite increasing the number of components.
Solution Approach 2:
The level shifter employs dynamic control mechanisms where the first and second power supply voltages can be independently adjusted and controlled. This dynamic approach allows the circuit to adapt to different operating conditions and optimize performance, enabling faster operation through controlled voltage transitions rather than fixed voltage conversion.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enhances the operating speed of the level shifter, reducing power consumption and enabling efficient signal transmission across voltage domains, thereby improving the overall performance of the electronic device.
Implementation Method 1
a capacitor configured to adjust the voltage of the output node to a fourth level by coupling in response to the voltage of the input node changing from the first level to a second level
Data Source
AI summary
Disclosed is an electronic device. The electronic device includes an input node, an output node, a power node that transfers a voltage of a third level to the output node when a voltage of the input node is a first level, and a capacitor that transfers a change in the voltage of the input node to the output node through a coupling such that a voltage of the output node is adjusted to a fourth level, when the voltage of the input node changes from the first level to a second level.